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The Revealing Module Pattern
Summary
The Revealing Module Pattern is a slight variation on the Module Pattern. IIFE's, local variables/functions, and a returned object literal with revealed data make up the structure and syntax of the Revealing Module Pattern. While it still maintains encapsulation of data, certain variables and functions are returned in an object literal.
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Functional Mixins
Summary
A factory function creates objects. It is invoked as normal function, not with the new operator. Functional mixins take things a bit further by accepting a mixin as an argument, copies properties and methods from the mixin, and returns a new object.
Composition > Inheritance
Unless you’ve been coding under a rock, you know about the ES6/ES201* class syntax, which offers a constructor function and demands that you include super() if you wanna use this anywhere in your function. This is great syntactically if you’re used to classical OOP languages, but I think it’s masking the most powerful and flexible aspect of JS: prototypes and object concatenation. Besides, class/constructor/super are just playing a prototypical shell game under the hood.
There are several ways to use a functional approach to creating new objects and patterns, one of which is called the Factory Function, and I really like it. I like it so much in fact that I cooked up my own implementation and called it Unifactory. I named it that because it takes an arbitrary number of arguments, analyzes their type and returns them as properties of an object.
Check it out...
function Factory () { const args = Array.from(arguments), obj = {}; obj.__proto__ = defaultProps; args.forEach(function(arg) { if (typeof(arg) === 'function') { obj[arg.name] = arg } else if (typeof(arg) === 'object') { for (let key in arg) { obj[key] = arg[key] } } else { obj[arg] = arg } }); return obj; } // Assign some default properties. ****/ const defaultProps = { defaultPhrase: function (phrase) { console.log(phrase); } }; //*************************************/ // Create an observer pattern. ************/ const customEvent = Factory({ events: {}, add: function (event, callback) { this.events[event] = callback; }, dispatch: function (event, args) { this.events[event](args); } }); customEvent.add('walk', function (dest) { console.log('I am walking to ' + dest); }); customEvent.dispatch('walk', 'the store.'); //*****************************************/ // Create some people with properties. ***************************/ let michael = Factory({name:'Michael'}, function speak (phrase) { console.log('I am ' + michael.name + ' and ' + phrase); }); let zick = Factory({name:'Zick'}, function say (phrase, action) { console.log('I am ' + zick.name + ', ' + 'and I '+ phrase + ' ' + action + '.'); }); zick = Object.assign(zick, { retort: function (phrase) { console.log(phrase); } }); michael.speak('I\'m a developer.'); zick.say('might be', 'surfing'); zick.retort('I\'m probably enineering something now.'); michael.defaultPhrase('This is the default phrase.'); //****************************************************************/
